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Cherry, oak, redwood, cedar, and walnut, as well as mahogany and many other tropical woods will darken. Pine, maple, and poplar are not especially pretty but are safer bets for use with soap if you don't want discoloration.

If you think about these different woods -- the darker the wood, the more likely it is to not play well with soap.

Supporting Member

"...mahogany will turn dark from soap...." <--- Just what I said. The wood turns dark from the alkalinity of the soap. The soap doesn't change much, unless there are dark particles from the wood that rub off onto the soap.

Supporting Member

Thankyou DeeAnna, I knew you would know the rest of the woods that will not work well for soap decks Pine holds up forever. I do know Black Walnut will turn black from the soap, and figured mahogany would do the same.